Refs #3420. Loading works. File identification works (at least for the types of nexus files available). Timestep iteration works. Users can select to reload the workspace into memory via GUI.

Speed improvements for rebinned SofQW. At the moment the algorithm name is SofQW2 so that it doesn't supercede the other until I get verification that it is doing the right thing. Re #2233

Added dedicated Quadrilateral class that has no dynamic vertex allocation to improve speed for rebinning. Refs #2233

this comment gets added to trac page for this ticket.
(previous one to this ticket didn't)

re #3413

Refs #3369: Parallelized the IterateEvents method of BinToMDHistoWorkspace. 2.5 times faster for the small iron data set; 5.3 times faster for a 200 Million event uniformly spread fake workspace.

Refs #3316: The parallel test might be unstable/not working on Windows, so disabling it for now. Additional mutex against simultaneous file access.

Refs #3316: IMDBox constructor with extents allows better initialisation of the boxes when loading from disk.

Refs #3271: Fix test. The number of voxels created should be equal to binsX*binsY*binsZ, not (binsX-1)*(binsY-1)*(binsZ-1), hence the change in the test.

Removed confusing message. Users don't need to see this. This type of messages is only useful when a solution is also given. Re #3203

Refs #3369: Using getBoxes() limited by an implicit function has sped up the iterateEvents way to bin MDEW from 61 msec to 28 msec (large region) or 37 msec to 6.7 msec (small region). This is for a fake workspace with 1 million events, binning into 60^3 bins.

Refs #3415: Performance test for MDGridBox->getBoxes() with an implicit function. Much faster than the iterator (about 100x faster).